(A) In the stratosphere, ultraviolet $(UV)$ radiation acts on molecular oxygen $(O_2)$ to split it into free oxygen atoms $(O)$.These free oxygen atom

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(A) In the stratosphere, ultraviolet $(UV)$ radiation acts on molecular oxygen $(O_2)$ to split it into free oxygen atoms $(O)$.These free oxygen atoms then react with molecular oxygen $(O_2)$ to form ozone $(O_3)$.The chemical reaction is as follows:$O_2 + \text{UV} \rightarrow O + O$$O + O_2 \rightarrow O_3$Therefore, the correct product is ozone $(O_3)$.